import java.util.Calendar;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class callable{
    public static void main(String[] args) {
        Callable<Integer> callable=new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                int sum=0;
                for (int i = 1; i <=100; i++) {
                    sum+=i;
                }
                return sum;
            }
        };
        FutureTask<Integer> futureTask=new FutureTask<>(callable);
        Thread t=new Thread(futureTask);
        t.start();
        int result= 0;
        try {
            result = futureTask.get();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
        System.out.println(result);
    }
}

